Patents by Inventor Brennan H. Fentzlaff

Brennan H. Fentzlaff has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20230228438
    Abstract: A thermostat for a building zone includes at least one of a model predictive controller and an equipment controller. The model predictive controller is configured to obtain a cost function that accounts for a cost of operating HVAC equipment during each of a plurality of time steps, use a predictive model to predict a temperature of the building zone during each of the plurality of time steps, and generate temperature setpoints for the building zone for each of the plurality of time steps by optimizing the cost function subject to a constraint on the predicted temperature. The equipment controller is configured to receive the temperature setpoints generated by the model predictive controller and drive the temperature of the building zone toward the temperature setpoints during each of the plurality of time steps by operating the HVAC equipment to provide heating or cooling to the building zone.
    Type: Application
    Filed: March 24, 2023
    Publication date: July 20, 2023
    Applicant: Johnson Controls Tyco IP Holdings LLP
    Inventors: Robert D. Turney, Matthew J. Ellis, Michael J. Wenzel, Mohammad N. ELBSAT, Juan Esteban Tapiero Bernal, Brennan H. Fentzlaff
  • Patent number: 11692724
    Abstract: An actuator for controlling a flow regulation device. The actuator includes a drive device coupled to the flow regulation device and a motor coupled to the drive device and operable to move the drive device. The actuator further includes a processing circuit configured to receive a first measurement of a characteristic, control the actuator to reposition the flow regulation device in a first direction, receive a second measurement of the characteristic, determine an installation error associated with at least one of the actuator and the flow regulation device based on the first measurement and the second measurement.
    Type: Grant
    Filed: April 30, 2020
    Date of Patent: July 4, 2023
    Assignee: Johnson Controls Tyco IP Holdings LLP
    Inventors: John T. Pierson, Abu Bakr Khan, Kirk H. Drees, Brennan H. Fentzlaff, Jeffry M. Papendorf
  • Patent number: 11644215
    Abstract: A system for controlling flow of a fluid through a heat exchanger in a heating, ventilation, or air conditioning (HVAC) system includes a flow control device operable to adjust the flow of the fluid through the heat exchanger, temperature sensors positioned to obtain a temperature differential of the fluid across the heat exchanger, and a controller configured to compare the temperature differential to a threshold. Responsive to the temperature differential being less than the threshold, the controller is configured to calculate an adjusted setpoint for the flow control device as a function of both the temperature differential and the threshold and operate the flow control device to adjust the flow of the fluid through the heat exchanger in accordance with the adjusted setpoint.
    Type: Grant
    Filed: October 5, 2021
    Date of Patent: May 9, 2023
    Assignee: Johnson Controls Tyco IP Holdings LLP
    Inventors: Rachel A. Glanzer, Brennan H. Fentzlaff, Kirk H. Drees
  • Patent number: 11644207
    Abstract: A thermostat for a building zone includes at least one of a model predictive controller and an equipment controller. The model predictive controller is configured to obtain a cost function that accounts for a cost of operating HVAC equipment during each of a plurality of time steps, use a predictive model to predict a temperature of the building zone during each of the plurality of time steps, and generate temperature setpoints for the building zone for each of the plurality of time steps by optimizing the cost function subject to a constraint on the predicted temperature. The equipment controller is configured to receive the temperature setpoints generated by the model predictive controller and drive the temperature of the building zone toward the temperature setpoints during each of the plurality of time steps by operating the HVAC equipment to provide heating or cooling to the building zone.
    Type: Grant
    Filed: October 10, 2019
    Date of Patent: May 9, 2023
    Assignee: Johnson Controls Tyco IP Holdings LLP
    Inventors: Robert D. Turney, Matthew J. Ellis, Michael J. Wenzel, Mohammad N. Elbsat, Juan Esteban Tapiero Bernal, Brennan H. Fentzlaff
  • Patent number: 11624524
    Abstract: A method for calibrating a flow sensor in a heating, ventilation, or air conditioning (HVAC) system. The method includes receiving, at a controller, a request to enter a calibration mode and, in response to receiving the request, automatically commanding a flow control device to achieve a target flow rate. The method further includes generating, by the controller, calibration data for the flow sensor using a reference flow value of the flow rate when the flow control device has achieved the target flow rate and a corresponding flow measurement from the flow sensor.
    Type: Grant
    Filed: December 30, 2019
    Date of Patent: April 11, 2023
    Assignee: Johnson Controls Tyco IP Holdings LLP
    Inventors: Homero L. Noboa, Kirk H. Drees, Jack A. Peterson, Brennan H. Fentzlaff
  • Patent number: 11519631
    Abstract: An adaptive flow limit controller for controlling a flow rate of a fluid through a heat exchanger includes a processing circuit. The processing circuit is configured to use an adaptive model to determine a threshold flow rate of the fluid through the heat exchanger at which a gradient of a temperature difference of the fluid across the heat exchanger with respect to the flow rate of the fluid through the heat exchanger has a threshold gradient value. The processing circuit is configured to operate a flow control device to maintain the flow rate of the fluid of through the heat exchanger at less than or equal to the threshold flow rate.
    Type: Grant
    Filed: January 10, 2020
    Date of Patent: December 6, 2022
    Assignee: Johnson Controls Tyco IP Holdings LLP
    Inventors: Brennan H. Fentzlaff, Kirk H. Drees, Timothy I. Salsbury, John M. House
  • Publication number: 20220357063
    Abstract: A freeze protection system for a heating, ventilation, or air conditioning (HVAC) system is shown. The freeze protection system includes a temperature sensor positioned at an inlet of a coil within which a liquid is at risk of freezing, and a controller comprising a processor and memory. The memory stores instructions that are executed by the processor. The processor is instructed to obtain a measured temperature of the liquid at the inlet of the coil from the temperature sensor, compare the measured temperature of the liquid at the inlet of the coil with a freeze prevention temperature threshold, engage a freeze prevention action in response to a determination that the measured temperature of the liquid at the inlet of the coil is less than or equal to the freeze prevention temperature threshold.
    Type: Application
    Filed: July 18, 2022
    Publication date: November 10, 2022
    Applicant: Johnson Controls Tyco IP Holdings LLP
    Inventors: Kirk H. Drees, Homero L. Noboa, Brennan H. Fentzlaff
  • Patent number: 11415335
    Abstract: A system for controlling a flow rate of a fluid through a valve is provided. The system includes a valve and an actuator. The actuator includes a motor and a drive device that is coupled to the valve for driving the valve between multiple positions. The system further includes a flow rate sensor and a controller that is communicably coupled with the flow rate sensor and the motor. The controller is configured to receive a first flow rate setpoint, determine a first actuator position setpoint using a proportional variable deadband control technique based on the first flow rate setpoint and a flow rate measurement, and receive a second flow rate setpoint. In response to a determination that certain low flow criteria are satisfied, the controller is configured to determine a second actuator position setpoint using the proportional variable deadband control technique based on a low flow compensation setpoint.
    Type: Grant
    Filed: July 18, 2019
    Date of Patent: August 16, 2022
    Assignee: Johnson Controls Tyco IP Holdings LLP
    Inventors: Jack A. Peterson, Kirk H. Drees, Brennan H. Fentzlaff, Homero L. Noboa, Brett M. Lenhardt
  • Patent number: 11391480
    Abstract: A freeze protection system for a heating, ventilation, or air conditioning (HVAC) system is shown. The freeze protection system includes a temperature sensor positioned at an inlet of a coil within which a liquid is at risk of freezing, and a controller comprising a processor and memory. The memory stores instructions that are executed by the processor. The processor is instructed to obtain a measured temperature of the liquid at the inlet of the coil from the temperature sensor, compare the measured temperature of the liquid at the inlet of the coil with a freeze prevention temperature threshold, engage a freeze prevention action in response to a determination that the measured temperature of the liquid at the inlet of the coil is less than or equal to the freeze prevention temperature threshold.
    Type: Grant
    Filed: December 4, 2019
    Date of Patent: July 19, 2022
    Assignee: Johnson Controls Tyco IP Holdings LLP
    Inventors: Kirk H. Drees, Homero L. Noboa, Brennan H. Fentzlaff
  • Publication number: 20220205668
    Abstract: A system includes a plurality of thermostats corresponding to a plurality of HVAC systems that serve a plurality of spaces and a computing system communicable with the plurality of thermostats via a network. The computing system is configured to, for each space of the plurality of spaces, obtain a set of training data relating to thermal behavior of the space, identify a model of thermal behavior of the space based on the set of training data, perform a model predictive control process using the model of thermal behavior of the space to obtain a temperature setpoint for the space, and provide the temperature setpoint to the thermostat corresponding to the HVAC system serving the space. The plurality of thermostats are configured to control the plurality of HVAC systems in accordance with the temperature setpoints.
    Type: Application
    Filed: March 8, 2022
    Publication date: June 30, 2022
    Applicant: Johnson Controls Tyco IP Holdings LLP
    Inventors: Kerry M. Bell, Bridget E. Kapler, Alan S. Schwegler, Leyla Mousavi, Kierstyn R. Robbins, Robert D. Turney, Matthew J. Ellis, Michael J. Wenzel, Mohammad N. ElBsat, Juan Esteban Tapiero Bernal, Brennan H. Fentzlaff
  • Patent number: 11274850
    Abstract: A system for controlling a flow rate of a fluid through a valve is provided. The system includes a valve and an actuator. An actuator drive device is driven by an actuator motor and is coupled to the valve for driving the valve between multiple positions. The system further includes a differential pressure sensor configured to measure a differential pressure across the valve and a controller that is communicably coupled with the differential pressure sensor and the motor. The controller is configured to receive a flow rate setpoint and the differential pressure measurement, determine an estimated flow rate based on the differential pressure measurement, determine an actuator position setpoint using the flow rate setpoint and the estimated flow rate, and operate the motor to drive the drive device to the actuator position setpoint.
    Type: Grant
    Filed: May 21, 2019
    Date of Patent: March 15, 2022
    Assignee: Johnson Controls Tyco IP Holdings LLP
    Inventors: Camille M. Aucoin, Brennan H. Fentzlaff, Homero L. Noboa, Duane S. Freimuth, Kirk H. Drees, Kenneth J. Sieth, Justin M. Salerno
  • Patent number: 11274849
    Abstract: A system includes a plurality of thermostats corresponding to a plurality of HVAC systems that serve a plurality of spaces and a computing system communicable with the plurality of thermostats via a network. The computing system is configured to, for each space of the plurality of spaces, obtain a set of training data relating to thermal behavior of the space, identify a model of thermal behavior of the space based on the set of training data, perform a model predictive control process using the model of thermal behavior of the space to obtain a temperature setpoint for the space, and provide the temperature setpoint to the thermostat corresponding to the HVAC system serving the space. The plurality of thermostats are configured to control the plurality of HVAC systems in accordance with the temperature setpoints.
    Type: Grant
    Filed: September 30, 2019
    Date of Patent: March 15, 2022
    Assignee: Johnson Controls Tyco IP Holdings LLP
    Inventors: Kerry M. Bell, Bridget E. Kapler, Alan S. Schwegler, Leyla Mousavi, Kierstyn R. Robbins, Robert D. Turney, Matthew J. Ellis, Michael J. Wenzel, Mohammad N. ElBsat, Juan Esteban Tapiero Bernal, Brennan H. Fentzlaff
  • Publication number: 20220026102
    Abstract: A system for controlling flow of a fluid through a heat exchanger in a heating, ventilation, or air conditioning (HVAC) system includes a flow control device operable to adjust the flow of the fluid through the heat exchanger, temperature sensors positioned to obtain a temperature differential of the fluid across the heat exchanger, and a controller configured to compare the temperature differential to a threshold. Responsive to the temperature differential being less than the threshold, the controller is configured to calculate an adjusted setpoint for the flow control device as a function of both the temperature differential and the threshold and operate the flow control device to adjust the flow of the fluid through the heat exchanger in accordance with the adjusted setpoint.
    Type: Application
    Filed: October 5, 2021
    Publication date: January 27, 2022
    Applicant: Johnson Controls Tyco IP Holdings LLP
    Inventors: Rachel A. Glanzer, Brennan H. Fentzlaff, Kirk H. Drees
  • Publication number: 20210341165
    Abstract: An actuator for controlling a flow regulation device. The actuator includes a drive device coupled to the flow regulation device and a motor coupled to the drive device and operable to move the drive device. The actuator further includes a processing circuit configured to receive a first measurement of a characteristic, control the actuator to reposition the flow regulation device in a first direction, receive a second measurement of the characteristic, determine an installation error associated with at least one of the actuator and the flow regulation device based on the first measurement and the second measurement.
    Type: Application
    Filed: April 30, 2020
    Publication date: November 4, 2021
    Inventors: John T. Pierson, Abu Bakr Khan, Kirk H. Drees, Brennan H. Fentzlaff, Jeffry M. Papendorf
  • Patent number: 11149976
    Abstract: A method for controlling flow in a heating, ventilation, and air conditioning (HVAC) system includes adjusting a setpoint associated with a valve based on a temperature change across a heating or cooling coil to reduce energy waste. The method includes receiving a first temperature measurement associated with an inlet of the coil, receiving a second temperature measurement associated with an outlet of the coil, calculating a difference between the first temperature measurement and the second temperature measurement, determining that the difference between the first temperature measurement and the second temperature measurement is below a threshold, and adjusting a setpoint associated with the valve. Additional control features may be provided to improve system behavior such as a pulse generation feature, a change-limiting feature, and a reevaluation feature.
    Type: Grant
    Filed: June 20, 2019
    Date of Patent: October 19, 2021
    Assignee: Johnson Controls Tyco IP Holdings LLP
    Inventors: Rachel A. Glanzer, Brennan H. Fentzlaff, Kirk H. Drees
  • Patent number: 11092354
    Abstract: A method for controlling flow in a heating, ventilation, and air conditioning (HVAC) system that imposes an upper limit on the flow of fluid through a heating or cooling coil. Imposing this limit on the flow rate ensures that a temperature change across the coil remains above a minimum threshold and can significantly reduce energy waste. The method includes receiving a first temperature measurement associated with an inlet of the coil, receiving a second temperature measurement associated with an outlet of the coil, and receiving a flow measurement associated with the valve, applying the first temperature measurement, the second temperature measurement, and the flow measurement as input to a model, determining a maximum flow rate that ensures that a difference between the first temperature measurement and the second temperature measurement is above a threshold using the model, and operating the valve in accordance with the maximum flow rate.
    Type: Grant
    Filed: June 20, 2019
    Date of Patent: August 17, 2021
    Assignee: Johnson Controls Tyco IP Holdings LLP
    Inventors: Rachel A. Glanzer, Brennan H. Fentzlaff, Kirk H. Drees, John M. House, Timothy I. Salsbury
  • Patent number: 11068000
    Abstract: A system for controlling a flow rate of a fluid through a valve is provided. The system includes a valve and an actuator. An actuator drive device is driven by an actuator motor and is coupled to the valve for driving the valve between multiple positions. The system further includes a flow rate sensor configured to measure the flow rate of the fluid through the valve and a controller that is communicably coupled with the flow rate sensor. The controller is configured to receive a flow rate measurement from the flow rate sensor, adjust a control deadband based on an actuator command history, and determine a compensated position setpoint using the flow rate measurement, the adjusted control deadband, and a proportional variable deadband control technique. The controller is further configured to operate the motor to drive the drive device to the compensated actuator position setpoint.
    Type: Grant
    Filed: July 11, 2019
    Date of Patent: July 20, 2021
    Assignee: Johnson Controls Technology Company
    Inventors: Jack A. Peterson, Brett M. Lenhardt, Homero L. Noboa, Brennan H. Fentzlaff
  • Publication number: 20210215384
    Abstract: An adaptive flow limit controller for controlling a flow rate of a fluid through a heat exchanger includes a processing circuit. The processing circuit is configured to use an adaptive model to determine a threshold flow rate of the fluid through the heat exchanger at which a gradient of a temperature difference of the fluid across the heat exchanger with respect to the flow rate of the fluid through the heat exchanger has a threshold gradient value. The processing circuit is configured to operate a flow control device to maintain the flow rate of the fluid of through the heat exchanger at less than or equal to the threshold flow rate.
    Type: Application
    Filed: January 10, 2020
    Publication date: July 15, 2021
    Applicant: Johnson Controls Technology Company
    Inventors: Brennan H. Fentzlaff, Kirk H. Drees, Timothy I. Salsbury, John M. House
  • Publication number: 20210199330
    Abstract: A method for calibrating a flow sensor in a heating, ventilation, or air conditioning (HVAC) system. The method includes receiving, at a controller, a request to enter a calibration mode and, in response to receiving the request, automatically commanding a flow control device to achieve a target flow rate. The method further includes generating, by the controller, calibration data for the flow sensor using a reference flow value of the flow rate when the flow control device has achieved the target flow rate and a corresponding flow measurement from the flow sensor.
    Type: Application
    Filed: December 30, 2019
    Publication date: July 1, 2021
    Applicant: Johnson Controls Technology Company
    Inventors: Homero L. Noboa, Kirk H. Drees, Jack A. Peterson, Brennan H. Fentzlaff
  • Publication number: 20210172634
    Abstract: A freeze protection system for a heating, ventilation, or air conditioning (HVAC) system is shown. The freeze protection system includes a temperature sensor positioned at an inlet of a coil within which a liquid is at risk of freezing, and a controller comprising a processor and memory. The memory stores instructions that are executed by the processor. The processor is instructed to obtain a measured temperature of the liquid at the inlet of the coil from the temperature sensor, compare the measured temperature of the liquid at the inlet of the coil with a freeze prevention temperature threshold, engage a freeze prevention action in response to a determination that the measured temperature of the liquid at the inlet of the coil is less than or equal to the freeze prevention temperature threshold.
    Type: Application
    Filed: December 4, 2019
    Publication date: June 10, 2021
    Applicant: Johnson Controls Technology Company
    Inventors: Kirk H. Drees, Homero L. Noboa, Brennan H. Fentzlaff